<template>
  <div class="person">
    <h2>汽车信息：一辆{{ car.brand }}车，价值{{ car.price }}万</h2>
    <button @click="changeBrand">修改汽车的品牌</button>
    <button @click="changePrice">修改汽车的价格</button>
    <button @click="changeCar">修改汽车</button>
    <hr>
    <h2>当前求和为：{{ sum }}</h2>
    <button @click="changeSum">点我sum+1</button>
  </div>
</template>

<script lang="ts" setup name="Person">
import { ref, reactive } from 'vue'

// 数据
let car = reactive({ brand: '奔驰', price: 100 })
let sum = ref(0)

// 方法
function changeBrand() {
  car.brand = '宝马'
}
function changePrice() {
  car.price += 10
}
function changeCar() {
  // car = {brand:'奥拓',price:1} //这么写页面不更新的
  // car = reactive({brand:'奥拓',price:1}) //这么写页面不更新的

  // 下面这个写法页面可以更新(覆盖追加到原对象里面)
  Object.assign(car, { brand: '奥拓', price: 1 })
}
function changeSum() {
  // sum = ref(9) //这么写页面不更新的
  sum.value += 1
}

</script>

<style scoped>
.person {
  background-color: skyblue;
  box-shadow: 0 0 10px;
  border-radius: 10px;
  padding: 20px;
}

button {
  margin: 0 5px;
}

li {
  font-size: 20px;
}
</style>